There was plenty that we could repair on the Abrams, but yes with certain assemblies you swap the entire assembly. The engine and transmission are all one piece (referred to as “the pack”) and could be replaced as a single unit by our I-level (Battalion maintenance support). All track maintenance was done at the O-level (the tank crew). Most of the turret subassemblies were O-level or I-level replaceable. The entire fire control system was D-level (depot).
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